Local Weak Ferromagnetism in Single-Crystalline Ferroelectric<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>BiFeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Ramazanoglu, M.; Laver, Mark; Ratcliff, William; Watson, Shannon; Chen, Wangchun; Jackson, Andrew; Kothapalli, Karunakar; Lee, Seongsu; Cheong, S.‐W.; Kiryukhin, V.

doi:10.1103/physrevlett.107.207206

Cited by 148 publications

(128 citation statements)

References 26 publications

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“…Whereas susceptibility measurements 5 indicate that S 0 = 0.015, a recent neutron-scattering study 24 suggests that S 0 ∼ 0.05 equivalent to τ ∼ 1…”

Section: Microscopic Modelmentioning

confidence: 99%

Spin-induced polarizations and nonreciprocal directional dichroism of the room-temperature multiferroicBiFeO3

et al. 2015

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A microscopic model for the room-temperature multiferroic BiFeO3 that includes two Dzyaloshinskii-Moriya interactions and single-ion anisotropy along the ferroelectric polarization predicts both the zero-field spectroscopic modes as well as their splitting and evolution in a magnetic field. Due to simultaneously broken time-reversal and spatial-inversion symmetries, the absorption of light changes as the magnetic field or the direction of light propagation is reversed. We discuss three physical mechanisms that may contribute to this absorption asymmetry known as non-reciprocal directional dichroism: the spin current, magnetostriction, and single-ion anisotropy. We conclude that the non-reciprocal directional dichroism in BiFeO3 is dominated by the spincurrent polarization and is insensitive to the magnetostriction and easy-axis anisotropy. With three independent spin-current parameters, our model accurately describes the non-reciprocal directional dichroism observed for magnetic field along [1, −1, 0]. Since some modes are almost transparent to light traveling in one direction but opaque for light traveling in the opposite direction, BiFeO3 can be used as a room-temperature optical diode at certain frequencies in the GHz to THz range. Our work demonstrates that an analysis of the non-reciprocal directional dichroism spectra based on an effective spin model supplemented by first-principles calculations can produce a quantitative microscopic theory of the magnetoelectric couplings in multiferroic materials.

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“…Whereas susceptibility measurements 5 indicate that S 0 = 0.015, a recent neutron-scattering study 24 suggests that S 0 ∼ 0.05 equivalent to τ ∼ 1…”

Section: Microscopic Modelmentioning

confidence: 99%

Spin-induced polarizations and nonreciprocal directional dichroism of the room-temperature multiferroicBiFeO3

et al. 2015

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“…The cycloid is ferroelectrically induced, averages out the local magnetic moments, has a large periodicity of $64 nm, and propagates along [110] of the pseudocubic unit cell. 6 All three magnetic ordering levels sensitively depend on the external control parameters like temperature, the electric field, or pressure, and are relatively robust against magnetic induction fields, [8][9][10][11][12][13][14][15] reviewed in Ref. 6.…”

mentioning

confidence: 99%

Sub-terahertz spectroscopy of magnetic resonance in BiFeO3 using a vector network analyzer

Caspers

Gandhi

Magrez

et al. 2016

Applied Physics Letters

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Detection of sub-THz spin cycloid resonances (SCRs) of stoichiometric BiFeO3 (BFO) was demonstrated using a vector network analyzer. Continuous wave absorption spectroscopy is possible, thanks to heterodyning and electronic sweep control using frequency extenders for frequencies from 480 to 760 GHz. High frequency resolution reveals SCR absorption peaks with a frequency precision in the ppm regime. Three distinct SCR features of BFO were observed and identified as Ψ1 and Φ2 modes, which are out-of-plane and in-plane modes of the spin cycloid, respectively. A spin reorientation transition at 200 K is evident in the frequency vs temperature study. The global minimum in linewidth for both Ψ modes at 140 K is ascribed to the critical slowing down of spin fluctuations.

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“…Dzyaloshinskii-Moriya (DM) interaction is the possible mechanism for this weak ferromagnetism. The DM interaction [27][28][29] in these samples is enhanced by the increased rotation of distorted FeO 6 octahedra with increase in ionic radii of the dopant. This is confirmed by the change in the bond angle and bond distances.…”

Section: Magnetic Propertiesmentioning

confidence: 97%

Crystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopy

et al. 2014

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Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics were studied using x-ray, neutron diffraction and magnetization techniques. All the samples crystallized in rhombohedral structure with space group R3c. The compounds exhibit antiferromagnetic (AFM) ordering at 300 K and no evidence of further structural or magnetic transition was observed on lowering of temperature below it. The magnetic structure of these substituted compounds are found to be collinear G-type AFM structure as against the non collinear incommensurate magnetic structure reported in the case of parent compound. The moments on Fe at 6 K are aligned along the a-axis in the case of Ca-doped sample. With increase in the ionic radii of dopant, the moments are found to be aligned in the ac plane and the angle of tilt away from the a-axis increases. The observed change in the magnetic structure with substitution is attributed to the intrinsic structural distortion as evidenced by the change in the bond angle (Fe-O-Fe) and bond distances (Bi-O, Fe-O). It has been found that heterovalent substitution A2+ results in the formation of oxygen vacancies in the parent lattices as the possibility of Fe4+ ruled out by Mössbauer spectra recorded at room temperature. Higher value of remnant magnetization (0.4187 emu/g) and coercivity (4.7554kOe) is observed in Bi0.8Ba0.2FeO3 sample in comparison to other substituted samples revealing a strong correlation between ionic radii and magnetization.

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Local Weak Ferromagnetism in Single-Crystalline FerroelectricBiFeO3

Cited by 148 publications

References 26 publications

Spin-induced polarizations and nonreciprocal directional dichroism of the room-temperature multiferroicBiFeO3

Spin-induced polarizations and nonreciprocal directional dichroism of the room-temperature multiferroicBiFeO3

Sub-terahertz spectroscopy of magnetic resonance in BiFeO3 using a vector network analyzer

Crystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopy

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